Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nam buoc » nam duoc, nam quoc, nam thuoc
buoc ban » quoc ban, buon ban, duoc ban
ban danh » ban doanh, ban hanh, ban dan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
danh de » hanh de, dan de, dang de
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, 5 hoi
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang ((((x hoi) or (x ho))) or (o hoi)). hieu quang nam buoc ban danh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((((x hoi) OR (x ho))) OR (o hoi)). hieu quang nam buoc ban danh de cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((((x hoi) or (x ho))) or (o hoi)). hieu quang nam buoc ban danh de cua tre*.